Booksarewrittenforuse，andthebestcomplimentthatthecommunityinthefieldcouldhavepaidtothefirsteditionof1998wastobuyouttheprintrun，andthatofthecorrectedprinting，ashappened.Meanwhile，thefast-developingfieldofmathematicalfinancehadmovedon，ashadourthinking，anditseemedbettertorecognizethisandundertakeathorough-goingre-writeforthesecondeditionthantotinkerwiththeexistingtext.